-al -ol a-a a-b aaa aab aal aao aap aas ab- aba abb abl abo abp abs al- ala alb all alo alp als aoa aob aol aoo aop aos ap- apa apb apl apo app aps as- asa asb asl aso asp ass b-p baa bab bal bao bap bas bba bbb bbl bbo bbp bbs bla blb bll blo blp bls boa bob bol boo bop bos bpa bpb bpl bpo bpp bps bsa bsb bsl bso bsp bss l-p la- laa lab lal lao lap las lba lbb lbl lbo lbp lbs lla llb lll llo llp lls loa lob lol loo lop los lpa lpb lpl lpo lpp lps lsa lsb lsl lso lsp lss oaa oab oal oao oap oas ob- oba obb obl obo obp obs ola olb oll olo olp ols oo- ooa oob ool ooo oop oos op- opa opb opl opo opp ops os- osa osb osl oso osp oss p-p paa pab pal pao pap pas pba pbb pbl pbo pbp pbs pla plb pll plo plp pls poa pob pol poo pop pos ppa ppb ppl ppo ppp pps ps- psa psb psl pso psp pss saa sab sal sao sap sas sba sbb sbl sbo sbp sbs sla slb sll slo slp sls soa sob sol soo sop sos spa spb spl spo spp sps ss- ssa ssb ssl sso ssp sss